MAC Help needed

[Mac attack]

I've got a MAC Mini, nearly one year old. The last couple of days its been playing up - internet slowing down, music not playing correctly (sound distorted), keyboard not responding at times. I've done a speed test and thats come out fine. I've run CLAMX AV and that hasn't shown up anything. If anyone has any ideas they would be most appreciated.
Thanks

[fo3nix]

There are some things mentioned here:
http://www.apple.com/support/mac101/help/

I'd suggest running the disk utility as it says, and repair permissions.

If that doesn't solve anything, try asking in the Apple support forums: you'll get far better answers than here.